Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a fragmentary enlarged front view surrounded by line 6-6 in FIG. 2;

FIG. 7 is a section view taken along line 7-7 in FIG. 6; and,

FIG. 8 is a reference enlarged front view of FIG. 6, showing deep grooves by coloring with black.

In the drawings, the broken lines defining portions of the tread, the sidewall, inner bead and the peripheral boundary between the claimed tire tread and the unclaimed sidewall depict environmental subject matter that forms no part of the claim. The unevenly dashed broken lines are for the purpose of illustrating the claim boundary which forms no part of the claim. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 